Safety device for steam-boilers.



"Nm 893,036- 4 v y PATENTED JULY 14, 1908.

A n J..ULRIH.'& C. LE '1 ".[BRI.`

SAFETY DEVICE FOR STEAM BOILERS. APPLIoATIoN FILED SEPT. 1s. 1907.

' 9 7 y I l l u Y /0 /5 5 v/7 1 1 I 37 l 5514 I //pzg/ M @www JOHN ULRICH AND CHARLRsl LHTTERI, or COLUMBUS, OHIO.

lSAFETY DEVICE FOR STEAM-BOILERS.

Specification of Letters Patent.

Patented July 14, 1908.

Application led September 18, 1907. Serial No. 393,427.

vision of a device of this character construct-v ed in such manner that if the water in the boiler drops below a predetermined point, a valve will be automatically operated to admit steam from the boiler to the lire box to smother the fire.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawing: Figure 1 is a vertical sectional view of the rear portion of a locomotive boiler illustrating the manner of applying this improved safety device thereto, Fig. 2 is a vertical sectional view of the improved safety device itself, and, Fig. 3 is a horizontal section upon line x-x of Fig. 2. Like numerals designate corresponding parts in all of the figures Of the drawing.

Referring to the drawing, the numeral 5 designates the rear ortion of a locomotive boiler. A ipe 6 which opens into the re box throug the crown sheet. of the boiler is connected by an L 7 with a pipe 8. The pipe upper portion and provides means for securing the casing to the front'of the boiler. A

gage or water glass 19 is connected to theV casing as at 20 and 20 and rovides means for indicating the height o water in the boiler in the usual manner. 4A float 21 is disposed within the casing 13 and this float has a stem 22 threaded therein, said stem being held against turning with relation to the float, by a lock nut 23. The u per end of the stem is formed into a nee e valve 24 which is adapted to Contact with a valve seat 25 formed'in a pendent portion 26 which is carried by a plate 27. This plate has an outstanding annular flange 28 which rests upon a shoulder 29 of the casing 13, the plate and the pendent portion being securely held in position when the cap plate 12 is fastened in position by nuts 30 which are screwed upon olts 31. The pendent portion 26 is cut out as at`32 for the reception'of a piston 33. A piston rod 34 connected to this piston forms the stem of a valve 35. A port 36 leads from the lower portion of the chamber 32 to a relief valve 37.' A plug 38 in which the piston rod 34 is slidably dis osed, closes the upper portion of the cham er 32. A port 39 formed in this plu is in communication with the pipe 10 throug a port 40.. The valve 35 normally closes the port 39, said port 39 being in communicationl by ports 41 and 42 (see Fig. 3) with the interior of the casing 13. The operation of the'device is as follows:

As long as water is resent in the boiler to such a height as to ift the float 21 to such position as to maintain the valve 24 in engagement with its seat 25, the parts will all be inthe osition illustrated in Fig. 2. If, however, t e water in the boiler should fall to such a level that the float is ermitted to descend, steam will enter throug the port 43 to the chamber 32, the relief valve 37 being normally closed. The steam acts u on the piston 33 to elevate said piston an consequently to lift the valve 35 from its seat. The steam and water may then flow through the ports 42, 41, 39 and 40 to pi e 10 and from pipe 10v to the fire box throng the connections described, where it will smother the fire sufficiently to prevent an explosion until the engineer or fireman can introduce more water to the boiler. When upon the introduction of water to the boiler, the float is again lifted and the flow of steam to the chamber 32 is cut off, the piston would not immediately descend to close the port 39 and thereby cut off the flow of steam to the iire box if the relief valve 37 were not rovided. When this relief valve is open, al pressure under the piston is relieved and the valve and piston will drop by gravity to cut off the flow `of steam through the port 39. If this relief valve were not provided, the expansion of the steam when confined in the lower tion ofthe chamber 32 would hold the piston in an elevated position even after the float had been lifted by the introduction of water to the boiler. By providing this relief valve, the flow of steam to the fire box may be stopped just as soon as a suiiicient quantity of water has been permitted to enter the boiler. Since the l'low of steam to the lire box is downwardly past the valve 35, it will of course be understood that this will also tend to close said valve.

From the foregoing description, it will be seen that simple and efficient means are herein provided for accomplishing the objects of the invention, but while the elements shownV and described are well adapted to serve the purposes for which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but includes within its purview such changes as may be made within the scope of the appended claims.

What we claim, is:

1. In a device of the character described, the combination with a steam boiler, of a casing, a pipe leading from said steam boiler t0 said casing, a pipe leading from said casing to the fire box ot the boiler, and a valve mechanism located within said casing and adapted when the water in the boiler drops to a predetermined level to admit steam at boiler pressure to thev pipe leading to the lire box.

trolled valve mechanism located within said casing and adapted when the water in the boiler drops to a predetermined level to ad mit steam at boiler pressure to the pipe leading to the iire box.

3. ln a device of the character described, the combination with a steam boiler, ol a casing, a pipe leading from said steam boiler to said casing, a pipe leading from said casing' to the iire box of the boiler, a valve located within said casing and adapted to control the iiow of steam from the interior oi said casingl to the lire box, a piston to which said valve is connected, a iioat, and a valve connected to said float, said latter valve being` adapted to control the flow of steam te said piston.

4. In a device of the character described, the combination with a steam boiler, ol' a casing, a pipe leading from said steam boiler to said casing, a pipe leading from said casini,r to the iire box of the boiler, a valve located within said easing and ad apted to control the ilow of steam from the interior of said casing to the ire box, a piston to which said. valve is connected, a iioat, a-valve connected to said float, said latter valve being' adapted to control the Vllow of steam to said piston, a chamber in which said piston is slidably disposed, a port leading from said chamber, and a relief valve adapted to open or close said port.

In testimony whereof we aHx our signatures in presence of two witnesses.

JOHN ULRICH. CHARLES IiE'lTEItl. Witnesses L. CARL SToUGnToN, A. L. PHELPS. 

